Shuttle-tip.



R. E. COOLIDGE.

SHUTTLE TIP.

APPLICATION FILED AUG-6.1915.

mama Patented Sept. 4,1917.

VViTnesses. Inventor.

ATTys.

WWI? I WTTED SATES ATNT UT FT UE.

ROGER-E. COOLIIDGE, OF SOU'IHIBRIDGE, MASSACHUSETTS, ASSIGNOR TO LITGHFIELD SHUTTLE COMPANY, OF SOUTHBRIDGE, .MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

SHUTTLE-TIP.

Specification of Letters Patent.

Patented Sept. 4., 191?.

Application filed August 6, 1915. Serial No. 44,096.

To all whom it may concern Be it known that I, ROGER E. CooLIDcE, a.

citizen of the United States, and resident of Southbridge, county of \Vorcester, State of Massachusetts, have invented an Improvement in Shuttle-Tips, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to improvements in tips for loom shuttles.

As is well known loom shuttles are pro vided at their opposite ends with conoidal metllic tips usually of steel which are adapted to receive the force of the blow of the picker and to avoid injury to the wooden body of the shuttle.

It is very necessary that these shuttle tips be positioned properly upon and secured firmly to the ends of the shuttle body and the axes of the shuttle tips must be abso lutely in alinement with or parallel to the axis of the shuttle body in order that the shuttle may be propelled across the lay with accuracy. The shuttle tips have heretofore been made in various forms, usually being provided with cylindrical stems or tangs integral with the tips and adapted to be inserted in slightly smaller cylindrical holes in the end of the shuttle body. In inserting these stems or tangs however, the shuttles are he quently split by reason of the fact that there must be a sufiicient difference in diameter of the tang or stem and the hole in which it is seated to prevent the extraction of the stem from the shuttle body when the shuttle is in operation.

In order to avoid this difliculty shuttle tips have been provided with shanks of various forms, one of which is disclosed in Patent No. 83,359. That construction comprises an angular twisted shank upon which the tip is secured by a screw-threaded connection. This form of device has been found to be impractical for the reason that in twisting the shank it is almost invariably distorted so that when the shank is forced into the shuttle body the tip will not rest squarely upon the end of the shuttle body and also for the reason that in use the tip will soon be loosened from its seat and the proper operation of the shuttle will thereby be rendered impossible.

The present invention is designed to overcome the defects above set forth and to provide a shuttle tip which may be easily manufactured and one which will seat properly upon the end of the shuttle and which may not be removed or displaced therefrom as easily as the shuttle tips now in use. This tip comprises a steel tip having an integral stem or shank in which one or more threads are rolled. The shank or stem of the tip thus formed is absolutely at right angles to the shoulder of the tip and passes accurately through the apex of the cone shaped end.

In the drawing Figure 1 illustrates a loom shuttle the body being broken away at its middle in order to afford room for illustration of the shuttle tips.

Fig. 2 is a side elevation of my improved form of shuttle tip.

This shuttle tip comprises the usual solid conoidal portion 1 having a shoulder or base 2 at right angles to the axis of the conoidal portion and a stem 3 extending from the base portion and having its axis coincident with the axis of the conoidal portion.

The shank is provided with helical ribs or screw threads 4, having sharply defined edges which are formed thereon by rolling. When this shuttle tip is inserted in the shuttle as is illustrated in Fig. 1 the tang or stem of the tip is driven into a suitable hole bored concentrically of the circle forming the end of the shuttle body. By reason of the fact that there are grooves between the screw threads the stem can be forced readily into the end of the shuttle body without splitting the same, and the sharp edges of the ribs cut into the walls of the hole in which the shank is inserted providing a gripping action which will prevent the displacement or withdrawal of the tip under any condition. It has been found by practical test that a force equal to three times that required to withdraw the stem of the ordinary shuttle tip from its seat in the shuttle body fails to withdraw or even loosen a shuttle tip embodying this invention.

In order to insure absolute accuracy of alinement of the stem the tang of the shuttle tip with the axis of the tip and of the shuttle body I have found it expedient to produce these shuttle tips by the following novel process.

The tip and its stem, which are ordinarily made cylindrical in form are produced by drop forging. The stems are then passed between corrugated rollers which form spiral ribs or threads upon said stems such as are disclosed in Fig. 2. The tip thus formed may be placed in a suitable chuck and the conoidal surface accurately ground in any well known manner, or if desired the shuttle tip may be first ground and the ribs or threads afterward rolled upon the shank. In order that the end of the shank may enter readily into the hole in the shut tle body, the end of the tang or shank is de- Birably made smaller or tapered and this may be accomplished either during the rolling of the shank by suitably formed rolls or it may be ground after the shank is otherwise finished.

The rolling of the ribs or threads upon the shank serves a two-fold purpose, the one to provide gripping members which may be embedded in the walls of the holes in the shuttle body, and the other to insure the absolutely accurate axial position of the shank in respect to the conoidal end portion whereby the shuttle tip will be properly seated when it is forced into the shuttle body.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

A shuttle tip comprising a conoidal metallic body having a flat base at right angles to the axis thereof and a central stem extending axially from said body, said stem having a plurality of rolled helical ribs of long spirals presenting oppositely disposed sharp edges.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ROGER E. OOOLIDGE.

Witnesses:

OSWALD B. GARsoN, CLYDE G. HILTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

